In the straight line method, the expression for depreciation of a machine having
purchasing cost C, scrap value S and useful life of the machinery n, is _____.

A

$$\frac{(C+S)}{n}$$

B

$$\frac{(C-S)}{n}$$

C

$$[1-(\frac{C}{S})]\times n$$

D

$$[1+(\frac{C}{S})]\times n$$